# -*- coding: utf-8 -*- # # Copyright (C) 2013 GNS3 Technologies Inc. # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see . """ Interface for Dynamips virtual Frame-Relay switch module. http://github.com/GNS3/dynamips/blob/master/README.hypervisor#L642 """ import os from ..dynamips_error import DynamipsError import logging log = logging.getLogger(__name__) class FrameRelaySwitch(object): """ Dynamips Frame Relay switch. :param hypervisor: Dynamips hypervisor instance :param name: name for this switch """ _instances = [] def __init__(self, hypervisor, name): # find an instance identifier (0 < id <= 4096) self._id = 0 for identifier in range(1, 4097): if identifier not in self._instances: self._id = identifier self._instances.append(self._id) break if self._id == 0: raise DynamipsError("Maximum number of instances reached") self._hypervisor = hypervisor self._name = '"' + name + '"' # put name into quotes to protect spaces self._hypervisor.send("frsw create {}".format(self._name)) log.info("Frame Relay switch {name} [id={id}] has been created".format(name=self._name, id=self._id)) self._hypervisor.devices.append(self) self._nios = {} self._mapping = {} @classmethod def reset(cls): """ Resets the instance count and the allocated instances list. """ cls._instances.clear() @property def id(self): """ Returns the unique ID for this Frame Relay switch. :returns: id (integer) """ return self._id @property def name(self): """ Returns the current name of this Frame Relay switch. :returns: Frame Relay switch name """ return self._name[1:-1] # remove quotes @name.setter def name(self, new_name): """ Renames this Frame Relay switch. :param new_name: New name for this switch """ new_name = '"' + new_name + '"' # put the new name into quotes to protect spaces self._hypervisor.send("frsw rename {name} {new_name}".format(name=self._name, new_name=new_name)) log.info("Frame Relay switch {name} [id={id}]: renamed to {new_name}".format(name=self._name, id=self._id, new_name=new_name)) self._name = new_name @property def hypervisor(self): """ Returns the current hypervisor. :returns: hypervisor instance """ return self._hypervisor def list(self): """ Returns all Frame Relay switches instances. :returns: list of all Frame Relay switches """ return self._hypervisor.send("frsw list") @property def nios(self): """ Returns all the NIOs member of this Frame Relay switch. :returns: nio list """ return self._nios @property def mapping(self): """ Returns port mapping :returns: mapping list """ return self._mapping def delete(self): """ Deletes this Frame Relay switch. """ self._hypervisor.send("frsw delete {}".format(self._name)) log.info("Frame Relay switch {name} [id={id}] has been deleted".format(name=self._name, id=self._id)) self._hypervisor.devices.remove(self) self._instances.remove(self._id) def has_port(self, port): """ Checks if a port exists on this Frame Relay switch. :returns: boolean """ if port in self._nios: return True return False def add_nio(self, nio, port): """ Adds a NIO as new port on Frame Relay switch. :param nio: NIO instance to add :param port: port to allocate for the NIO """ if port in self._nios: raise DynamipsError("Port {} isn't free".format(port)) log.info("Frame Relay switch {name} [id={id}]: NIO {nio} bound to port {port}".format(name=self._name, id=self._id, nio=nio, port=port)) self._nios[port] = nio def remove_nio(self, port): """ Removes the specified NIO as member of this Frame Relay switch. :param port: allocated port :returns: the NIO that was bound to the allocated port """ if port not in self._nios: raise DynamipsError("Port {} is not allocated".format(port)) nio = self._nios[port] log.info("Frame Relay switch {name} [id={id}]: NIO {nio} removed from port {port}".format(name=self._name, id=self._id, nio=nio, port=port)) del self._nios[port] return nio def map_vc(self, port1, dlci1, port2, dlci2): """ Creates a new Virtual Circuit connection (unidirectional). :param port1: input port :param dlci1: input DLCI :param port2: output port :param dlci2: output DLCI """ if port1 not in self._nios: raise DynamipsError("Port {} is not allocated".format(port1)) if port2 not in self._nios: raise DynamipsError("Port {} is not allocated".format(port2)) nio1 = self._nios[port1] nio2 = self._nios[port2] self._hypervisor.send("frsw create_vc {name} {input_nio} {input_dlci} {output_nio} {output_dlci}".format(name=self._name, input_nio=nio1, input_dlci=dlci1, output_nio=nio2, output_dlci=dlci2)) log.info("Frame Relay switch {name} [id={id}]: VC from port {port1} DLCI {dlci1} to port {port2} DLCI {dlci2} created".format(name=self._name, id=self._id, port1=port1, dlci1=dlci1, port2=port2, dlci2=dlci2)) self._mapping[(port1, dlci1)] = (port2, dlci2) def unmap_vc(self, port1, dlci1, port2, dlci2): """ Deletes a Virtual Circuit connection (unidirectional). :param port1: input port :param dlci1: input DLCI :param port2: output port :param dlci2: output DLCI """ if port1 not in self._nios: raise DynamipsError("Port {} is not allocated".format(port1)) if port2 not in self._nios: raise DynamipsError("Port {} is not allocated".format(port2)) nio1 = self._nios[port1] nio2 = self._nios[port2] self._hypervisor.send("frsw delete_vc {name} {input_nio} {input_dlci} {output_nio} {output_dlci}".format(name=self._name, input_nio=nio1, input_dlci=dlci1, output_nio=nio2, output_dlci=dlci2)) log.info("Frame Relay switch {name} [id={id}]: VC from port {port1} DLCI {dlci1} to port {port2} DLCI {dlci2} deleted".format(name=self._name, id=self._id, port1=port1, dlci1=dlci1, port2=port2, dlci2=dlci2)) del self._mapping[(port1, dlci1)] def start_capture(self, port, output_file, data_link_type="DLT_FRELAY"): """ Starts a packet capture. :param port: allocated port :param output_file: PCAP destination file for the capture :param data_link_type: PCAP data link type (DLT_*), default is DLT_FRELAY """ if port not in self._nios: raise DynamipsError("Port {} is not allocated".format(port)) nio = self._nios[port] data_link_type = data_link_type.lower() if data_link_type.startswith("dlt_"): data_link_type = data_link_type[4:] if nio.input_filter[0] is not None and nio.output_filter[0] is not None: raise DynamipsError("Port {} has already a filter applied".format(port)) try: os.makedirs(os.path.dirname(output_file)) except FileExistsError: pass except OSError as e: raise DynamipsError("Could not create captures directory {}".format(e)) nio.bind_filter("both", "capture") nio.setup_filter("both", "{} {}".format(data_link_type, output_file)) log.info("Frame relay switch {name} [id={id}]: starting packet capture on {port}".format(name=self._name, id=self._id, port=port)) def stop_capture(self, port): """ Stops a packet capture. :param port: allocated port """ if port not in self._nios: raise DynamipsError("Port {} is not allocated".format(port)) nio = self._nios[port] nio.unbind_filter("both") log.info("Frame relay switch {name} [id={id}]: stopping packet capture on {port}".format(name=self._name, id=self._id, port=port))